Intermap Technologies Inc.20161130DTM_n6930w14645P.tif1Digital Elevation ModelDigital Terrain ModelsCore Product Version: 4.4.1, Edit Rule Version: 3.6Englewood, COIntermap Technologies Inc.Intermap's DEM products are 3D raster datasets with elevations captured at 5-meter postings or every 5 meters. They are generated using Intermap's STAR technology (Interferometric Synthetic Aperture Radar), which is mounted to an aircraft. The Digital Terrain Model (DTM) data product represents the bare earth and is derived from the Digital Surface Model (DSM) using Intermap's proprietary algorithm and editing processes. Accuracy statements are based on unobstructed areas of moderately sloped terrain. Diminished accuracies are to be expected in areas of extreme terrain and dense vegetation. The DTM is stored as a contiguous dataset spanning continental land masses where we have captured data. It is available in specific areas of interest or in 15-minute by 15-minute tile areas. For more detailed information, refer to Intermap's Product Handbook at http://www.intermap.com/Portals/0/doc/Brochures/INTERMAP_Product_Handbook.pdf.The DTMs are used as a fundamental layer of information in 3D geospatial analysis and spatial information Decision Support Systems (DSS). Typical applications include storm surge analysis, flood planning and watershed analysis, radio propagation modeling, and contour generation. A number of the priority layers of spatial information recognized by the National Spatial Data Infrastructure may be derived from Intermap Technologies' DEMs including elevation, shoreline delineation, hydrography, slope, and aspect layers.2016072020160728The above dates refer to the time of field data acquisition and therefore reflect ground conditions at that time.CompleteOngoing-146.834662-146.41186869.76333769.486535MEL_Scientific-Engineering_Field_ThesaurusElevationCartographyGeodesyGeographyHypsographyMappingPhotogrammetryStereophotogrammetryTopographyRadarInterferometricRemoteSensingSARDEMDTMDSMORIINSARIFSARIFSAREGEOSARheightNoneAlaskaUSAMEL_Environmental_Domain_ThesaurusTerrainEarthSurfaceGroundFirst2016JulyPurchaseEnd User License AgreementIntermap Technologies Inc.Data Archive Managermailing address8310 South Valley Highway, Suite 400EnglewoodCO80112-5847USA(303) 708-0955(303) 708-0952service@intermap.comThis data was produced by Intermap Technologies Inc.This data is delivered on interoperable media with metadata. The data set was developed on a Microsoft Windows system using Intermap's propriatory Interferometric Editing System (IES).Calculation of the digital elevation model is described in the Intermap Technologies Core Product Handbook User's Guide. http://www.intermap.com/Portals/0/doc/Brochures/INTERMAP_Product_Handbook.pdfNoneNoneAll data products are 2 meters RMSE or better in areas of unobstructed flat ground.1 meter RMSE or better in unobstructed areas of unobstructed flat ground.The NEXTMap DTM data products are derived using Intermap Technologies' STAR-3 airborne Interferometric SAR data acquisition system. The data for this tile was captured at 25200 feet above mean sea level with a primary look direction of West and the swaths with IDs 74, 75, 77, 78, 79, 118 and 124. Small areas of missing data are interpolated using a continuous curvature spline over non-data areas. In larger areas of missing data, Intermap's proprietary editing process utilizes ancillary elevation data from secondary sources to fill the areas of missing data. Most incidents of missing data are due to radar shadow and layover in high-relief areas such as mountainous regions and highly developed urban areas and correspond to the look direction of the radar. Bodies of water are assigned an elevation which corresponds to the shoreline at the time the data was captured. Areas of null data are assigned the value -10000.20161130RasterGrid Cell58212709Albers Conical Equal Area55.065.0-154.050.00.00.0coordinate pair55metersNAD83 CORS96 EPOCH 2003.00GRS806378137.0298.257222101NAVD88(Geoid09)0.01metersImplicit coordinate32-bit imageThe DEM is a 32 bit image on a 15-minute by 15-minute (lat/long) grid. The origin of the post is center center.http://www.intermap.com/Portals/0/doc/Brochures/INTERMAP_Product_Handbook.pdfElevation value per grid cell.Height of the geoid, relative to mean sea level.http://www.intermap.com/Portals/0/doc/Brochures/INTERMAP_Product_Handbook.pdf162.92578.80meters0.01Project Area: Alaska, Mission Number: 4726http://www.intermap.com/Portals/0/doc/Brochures/INTERMAP_Product_Handbook.pdf20161130Intermap Technologies Inc.Data Archive Managermailing address8310 South Valley Highway, Suite 400EnglewoodCO80112-5815USA(303) 708-0955(303) 708-0952service@intermap.comFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998